练习材料：
L55-3: From the earth: Greetings
A telescope would have to be as far away as the planet Jupiter to look for life in outer space,
because the dust becomes thinner the further we travel towards the outer edges of our own solar system.
In the first instance,
we would be looking for plant life,
rather than 'little green men'.
The life forms most likely to develop on a planet would be bacteria.
It is bacteria that have generated the oxygen we breathe on earth.
For most of the earth's history they have been the only form of life on our planet.
As Earth-dwellers,
we always cherish the hope that we will be visited by little green men and that we will be able to communicate with them.
But this hope is always in the realms of science fiction.
If we were able to discover lowly forms of life like bacteria on another planet,
it would completely change our view of ourselves.
As Daniel Goldin of NASA observed,
'Finding life elsewhere would change everything.
No human endeavour or thought would be unchanged by it.'
应用配置：L0+L4
知识笔记：dwellers/dwɛlərz cherish/ʧɛrɪʃ realms/rɛlmz bacteria/bækˈtɪriə endeavour/ɪnˈdɛvər
练习感悟：用时41分钟。早上没时间，晚上接着朗读完成。本篇课文语感好，没有太多难度。
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